All cables have the potential to fail due to something called strain relief. Essentially, the joint where the cable meets the connector can separate and fray after being pulled at sharp angles and twisting constantly.
There have been a couple techniques in cable manufacturing that help prevent this outcome. The most common, which can be seen on any Apple cable you own, is a thin rubber tube acting as a stiffener for the cord in this region. It also protects the cord housing from rubbing against the connector body. A method used on higher-end devices is a wire spring tightly wound acting as the rubber tube does.
As it turns out, even the strain relief prevention methods doesn’t always help. These cables don’t self-destruct, and this type of wear is very preventable. However, a cheap and easy way to prevent this from happening in the future is by using shrink tubing. This is a cheap rubber tube that slips over a wire and shrinks snugly onto the cable when heat is applied. Slip it over both the connector housing and the first half-inch of the cable itself. This will act as a stiffener and protect the cable from strain relief damage.
Disclaimer: We do not recommend doing this to any cables under Apple warranty; it will void it. We also don’t recommend doing this if you don’t have previous experience with shrink tubing. Small Dog Electronics takes no responsibility for voiding of warranty or damages caused by modifying your cables.